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### 13 Cards in this Set

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 weight the measure of the force of gravity on an objet. velocity describes both speed and direction of an object. net force an object always changes the velocity of the object. Acceleration Rate of change of velocity. Average speed The total distance traveled divided by total time of travel. Balanced Forces Forces on objects that are equal in size and opposite in directoin. Constant Speed A speed that does not vary. Force A push or a pull one body exerts on another. Friction The force that opposes motion between two surfaces that are touching each other. Gravity Every object in the universe exerts force on every other object. Inertia The tendency of an object to resist any change in its motion. Instantaneous speed The rate of motion at any given instant. Speed The rate of change in position.